Istanbul Health and Technology University, Department of Anatomy, Seyitnizam, Mevlana St. No:85, 34015 Zeytinburnu/ Istanbul, TURKEY.
Department of Ear Nose Throat, School of Medicine, Istanbul Aydın University, Istanbul, TURKEY.
Otolaryngol Pol. 2023 Jan 14;77(2):1-4. doi: 10.5604/01.3001.0016.2167.
Injury of the external branch of the superior laryngeal nerve can cause a hoarse or weak voice due to the functional loss (dysergia) of the cricothyroid muscle. Defining the anatomical variations of the external branch of the superior laryngeal nerve and estimating the frequency of it, it makes crucial for surgical interventions.
To reveal the topography of the external branch in the Anatolian population, to prevent injury of it during the surgical intervention in the anterior neck region.
Twenty-six bilateral hemilarynges (4 females, 22 males) were dissected. The morphometric and morphological features of the external branch were examined. The obtained results were compared statistically left and right.
Landmarks such as the thyroid gland and laryngeal prominence were determined for the detection of the external branch. The variations of the course of the external branch and the points of piercing the cricothyroid muscle or inferior constrictor pharyngeal muscle were evaluated.
Although safe approaches have been described for nerve protection during neck surgeries, it can expose injuries during preliminary surgery approaches as the nerve is thinner and more superficial than other branches of the vagus nerve. However, it can be detected more easily and safely during the surgical approach by knowing the defined anatomical landmarks and morphological variations of the external branch.
The anatomical variations described can be a safe and important guide in surgical approaches to be applied in the anterior neck region.
由于环甲肌功能丧失（协同失调），喉上神经外支损伤可导致声音嘶哑或无力。定义喉上神经外支的解剖变异，并估计其发生频率，对于手术干预至关重要。
揭示安纳托利亚人群中外支的解剖结构，以防止在颈部前区手术干预时损伤其。
解剖了 26 对双侧半喉（4 名女性，22 名男性）。检查了外支的形态和形态特征。对左右两侧的结果进行了统计学比较。
确定了甲状腺和喉突等标志，以检测外支。评估了外支的行程变化以及刺穿环甲肌或下咽缩肌的部位。
尽管已经描述了颈部手术中保护神经的安全方法，但由于神经比迷走神经的其他分支更细、更浅，因此在初步手术方法中可能会暴露损伤。然而，通过了解外支定义的解剖标志和形态变异，可以在手术入路中更轻松、更安全地检测到它。
描述的解剖变异可以为颈部前区的手术入路提供安全且重要的指导。
